Macron also praised the work the Kurdish-led Syrian Democratic Forces, which freed large parts of northern and eastern Syria from ISIS. “I call on everyone … not to forget what we owe them,” he said.

Trump’s decision to withdraw was met with alarm across Europe. German foreign minister Heiko Maas in a statement that the threat of ISIS is “not over” and said that Trump’s decision “could hurt the fight against the IS and endanger what has been achieved.”

Trump’s decision is a move that many of the president’s advisers had warned against, and it was reportedly the final straw for Defence Secretary James Mattis, who has announced his resignation last week.

In his resignation letter, Mattis said that the US should be “treating allies with respect.”